FaRKle!

Rainier Arms' .308 barrels are available in AR-10 pattern as well. You should be able to drop in an LR308 pattern barrel just fine. You'll need the LR308 bolt and firing pin though (AR-10 firing pin is tapered and won't protrude through the firing pin hole enough).

Yemen already has dropped the money for it and was purchasing it. I say "was" because they're currently in pretty much a civil war right now...

Welcome! You're even using AR-10 in the proper context (we're known to be strict on that, the only AR-10 is Armalite AR-10 pattern, everything else is a .308/7.62 AR)! I see potential... Have you already bought the M&P 10? If not, you should try building one from the ground up. You should be able to make one that's even lighter weight and handles even better.

It should fit fine. That said, we aren't really a fan of those triggers here. The failure rate is pretty high.

Man this poop is just like the tech industry, one minute I get the best, MK6 with H58, and the next it's outdated because H59 came out! lol (I know the differences are small).

*pirate voice* ARRRRRR, what ye be talkin about?

16", 1:10

My PWS MK216 uses SI-D upper and lowers. PWS switched over to their own forged lowers after using SI-D for the MK2 MOD 0 and initial year of MOD 1s. I've put my upper on some other LR308 pattern lowers, but it also didn't work on some due to the front pivot pin ear being too wide. Never had any issues with G2 or G3 PMAGs...

I think it was to mark what to measure.

Aero Precision's barrels are made by Ballistic Advantage. You might have better luck searching for their reviews. You'll have to look at their 5.56 and 5.45 reviews though since they didn't start making .308 till Aero Precision started buying from them. They do have a good rep though.

Sounds like you'll get some awesome data! That'd be a super nice table to have with what brand of BCGs there are and what the measurements of different areas are! One important measurement is from the front of the carrier to where the shoulder of the carrier ends (the diameter goes down for the tail section), or rather from where the tail/end of the BCG is to the shoulder.

Welcome, and sweet rifle! The newer forged receivers look nicer than my earlier revision's SI-D ones. Drop an H3 buffer in there for even better recoil reduction! BTW, I never have to run the gas block more open than position two on mine.

Right there with ya man. I'm planning a sub-5 lbs build with that barrel.

Damn, guess I shouldn't have waited... I was highly considering it, but then again I couldn't really comprehend how it would be any different than my G2S or SSA already... Might get in on the free shipping promo though... I have been eyeing that Aimpoint T2 + LT660 combo for my SR-15 upper...

For an A2 fixed stock setup you'll want part 308-BS-11 and 308-BS-10B.

So who's FMC?

I was initially worried with the MechArmor/Velocity trigger since the design doesn't seem terribly different, however that one has worked 100% for me so far in the same rifle. You're correct that the kinetic energy delivered and acceleration are factors of the hammer spring since that's the only energy storing unit in the system. The rate at which it decompresses is determined by the mass it's pushing, initial amount of compression, and its spring constant. My guess would be that people skeletonize hammers to decrease the lock time.

More engineering thought about Elftmann's lack of engineering... Thinking about the trigger itself, the AR-10 model is billed as being better for harder primers due the the heavier hammer. This doesn't make physical sense to me given some rational assumptions about the system (since I doubt anybody, even Elftmann, has taken any hard data). We can assume that the heavier hammer is the only difference because the product description has the same characteristics for the hammer spring across multiple triggers (both the AR-10, service, and 3-gun triggers say they have a .043 "double-double" wound, polished, piano wire hammer spring, and two of them also have the same pull weight adjustment range). If we go back to basic physics, we know that energy is conserved. For an increase in the mass of the hammer we will see a corresponding decrease in its acceleration. This means increasing the mass will change the speed at which the hammer hits the firing pin (slower), but it shouldn't change the force (since the kinetic energy of the hammer hitting is the same). Therefore, since all the energy is stored in the spring while cocked, and that doesn't change going between their triggers all you're really doing is increasing the lock time, and not increasing the force/reliability of ignition in any way.

I guarantee you can. I was able to reproduce the initial problem the first time around. Adjust the pull too light and the trigger won't reset. Adjust it too heavy and the hammer won't release. The more I think about how they went about addressing (or not really addressing) the issues the more I scratch my head and wonder how anybody in engineering can follow their thought process... The second time I spoke with Art I told him I didn't adjust anything from where he set it and he said that it's OK if I did and encouraged me to play around with it even going so far as to take the whole thing apart and put it back together. How are you supposed to diagnose an issue if you introduce extra variability by playing around with it? Wouldn't you want to make sure nothing was touched so you have an established and tracked procedure of events and status? Partition testing is a core competency of root cause analysis and what they told me went completely against that. Swap monkey indeed.

In my industry there's been a tremendous amount of consolidation both on the customer and supplier side that continues to this day. What that means for a supplier like me is that every customer makes up a significant portion of my revenue each year, and to lose them would be a significant loss. I'd say that the most important tenet my company follows to prevent that is building and maintaining customer trust. The customers trusting us to follow through on our commitments, trusting us to back our products up, and trusting that we deliver the performance required to fulfill their needs is what makes us an industry leader. When your customers trust you, they want you to succeed and are willing and happy to aide you in your development to satisfy their requirements. Without that collaboration and incremental feedback, it's much more difficult to succeed and win business. Customer trust is an invaluable asset. Similar to my customers, I also believe that the companies that I spend money with should treat my customer trust with high regard. Recently, I dealt with two companies in one experience whose handling of my customer trust were polar opposites of each other. Those companies were Elftmann Tactical and Weaponsmart. The experience began with me ordering an ELF AR-10 trigger through the group buy here from Weaponsmart. I was a bit hesitant at first because the wait for the trigger was a bit long, but it arrived just fine. I installed the trigger in my .308 according to whatever materials were shipped with it (which I would find later were lacking), and adjusted the trigger pull a bit lighter to see how it felt. The first time I took it out to the range to test I encountered many malfunctions. The trigger wouldn't reset most of the time. When I arrived home I re-read all of the included material that came with the trigger and still wasn't able to find any answers to my issue. I turned to YouTube next, and finally found a video cautioning against lightening the trigger pull weight too much or the issue I encountered would appear (it also cautioned against making the pull too heavy to the point of malfunction as well). Armed with this knowledge I remedied my issue and saw no malfunctions while dry firing. The next time out at the range I was excited to see if this trigger changed how well I could shoot groups. Right from the first magazine though I encountered more malfunctions. This time I was getting light primer strikes on at least one round per five round group. I had never experienced light primer strikes in this rifle prior to this trigger (prior triggers were ALG QMS and Geissele SD-E). I went through approximately 30 rounds before growing frustrated and deadlining the gun for the day. When I returned home I decided to contact Elftmann Tactical about my issue. I tried calling them first a couple times during their business hours, but they never picked up and their messages were full so I resorted to their online contact form. Days went by before I received an email back instructing me to call a different number. The next couple business days I tried calling that number but nobody picked up the phone. I tried calling in the morning, middle of the day, and afternoon with no answer. This didn't give me much faith that Elftmann would be able to help me, but it was the only real option I felt I had. Finally, I was able to reach Art Elftmann on one call and he seemed genuinely surprised and concerned when I explained the issues I encountered and asked for his guidance. He told me that a new revision of the trigger was out (new housing) and that he wanted me to send my current trigger to his personal address so he could inspect the trigger and find out what went wrong with it. He was very straightforward and stressed that they stand behind their products. I was told that I'd receive a new trigger that was of the latest and greatest variety and that Art himself would set the pull weight to what he considered optimal and reliable. With things looking up I packed up my trigger with all of its original materials and packaging and sent it off. After a not unreasonable amount of time I came home to find a package from Elftmann Tactical at my door. I was excited for this new trigger and to experience all of the excellent characteristics that people here and elsewhere had praised. Upon picking up the package though something struck me as odd. The packaging was much smaller than the one I had sent off. As I opened it two baggies fell out, a brand new set of Elftmann's anti-walk pin set, and a plain plastic bag with nothing but a trigger. This was a bit disappointing because I was expecting a brand new trigger of the latest version as I was told over the phone. Furthermore, no retail packaging/materials were included. As I took the trigger out of the bag I was even more disappointed because the serial number on this unit was older than the one I had sent back. Upon further inspection of the wear surfaces I could see that this new trigger had much more use on it than my original one did too. I was angry, but I knew I could get over it as long as the trigger worked. I installed the trigger back into my .308 and decided to dry fire it to verify its function before validating performance at the range. The first couple of dry fires worked smoothly, however shortly thereafter a failure to reset occurred. I paused with a confused experession and cautiously continued to see if the malfunction would occur again. Sure enough, within the next five dry fires another failure to reset occurred. I continued this cycle very slowly and firmly following through and holding the trigger back, then lightly releasing with my finger to see if it would stay back and was able to reproduce this with ease. Immediately after I sent Elftmann Tactical an email with the issues. A couple business days went by with no response before I decided to start calling them. Just like before my first couple calls went unanswered, but finally Art picked up the phone again. I told Art I was experiencing issues again and asked him to verify my install method. He said what I did was correct and then told me to play around with the pull weight till the malfunction stopped. I replied that I hadn't touched it and didn't want to touch it because he committed to setting it at the spot he deemed optimal. I then asked him if he had found the root cause of the issue with my previous trigger and why I was sent a trigger that was older and had more wear on it than a new and latest revision that he had told be prior. He had no answers for either questions and didn't want to continue the conversation at this point. He rushed me away off the phone by closing with a proposal of me breaking in the trigger with a couple hundred rounds and playing with the pull settings to see if things work out. He said it didn't matter what I did with the trigger and if I broke it or it failed that they would replace it. After that he hung up. The message he spoke and the message I received from this were very different. Verbally he said he stood behind his products, but the actual message I got was that he didn't really care about my issues and wanted me to just go away. This also taught me a few other things. The lack of answers to the root cause failure of my first trigger made me question the competence of their engineering method. I have a term for companies and people whose solutions to issues is simply "swap the part out till one works." That term is "swap monkey." Swap monkeys don't solve problems, just cover them up, and that's what I'd characterize Elftmann Tactical as. The second thing I learned was that Elftmann Tactical's claim that they stand behind their products is pure BS. Standing behind their products would not shift the action item of diagnosing the issue purely to me. Neither would it involve telling me I need to spend over $100 (literally said hundreds of rounds) breaking in their trigger to see if it works. Given that the trigger I received already looked well used, how was I to know it wasn't broken in already? Finally, this experience taught me that Art Elftmann doesn't do his due diligence. When you personally commit to me that you're going to optimize the trigger pull, you had better also verify that it works. Failing to do that says your work is sloppy and untrustworthy. The day after that call I decided I didn't want to spend any more time or resources on this trigger and I didn't care for a new one. I didn't want it to succeed, I just wanted it gone and my money back. Just like before, I tried calling Elftmann Tactical a couple times and every time there was no answer. There was now only one more avenue to try as an honest person, and I felt really bad doing it, but would give it a shot. I emailed Weaponsmart, detailed my exchanges with Elftmann Tactical, and asked them if they would be willing to help me return the trigger to them. I explicitly stated that if there was anything I could do to help them receive return credit from Elftmann Tactical that I would be more than happy to do it. I really hated bringing them into this because this issue wasn't their fault, wasn't their responsibility, and would likely cost them some. In an about face from my previous experiences, I received an email within 24hrs from Jay, who said he was disappointed with the way Elftmann handled my issue and was absolutely willing to help me return the trigger to him and issue a refund. He also offered me some possible solutions for getting in contact with Elftmann Tactical more easily in case I wished to solve the issue, but said he understood if I didn't want to deal with them anymore as well. Logistics were worked out and throughout this exchange Jay's responses were always very prompt and helpful. I shipped the trigger and anti-walk pin kit to Weaponsmart, and received an email on a Saturday confirming that it had arrived and asking me how I'd prefer a refund. Once I replied back Jay immediately issued the refund and sent a confirmation email to me of it. He also apologized for what I had gone through and wished me the best. I replied that I was grateful for his support and reiterated that I was willing to help them however I could to get return credit from Elftmann. Jay promptly replied that I shouldn't worry about that and even if he lost money on this transaction it was most important that I as a customer was taken care of. I can confidently say that Jay and Weaponsmart have my full customer trust. Their willingness to help me when they had no obligation to do so and very speedy replies showed me that they really stand behind what they sell. Their follow up of my return said that I can have faith and trust what they say and commit to. These are all complete opposites of what Elftmann Tactical told me about themselves. I could care less if Elftmann Tactical fails now, and a part of me hopes they do so that nobody else has to go through the wretched process of dealing with them. On the contrary, I want Weaponsmart to succeed, and am looking to see if they carry anything I might want so I can purchase from and support them. They have rightfully earned my full customer trust. TL;DR -Elftmann Tactical CS and integrity sucks, don't buy their crap. -Weaponsmart is an honest vendor that you can fully trust.

Elftmann can go screw themselves as far as I'm concerned. Will make a thread to follow...

PMAGs and other reliable poly mags have definitely had issues (Gen 1 5.56 PMAGs, G3 PMAG LR bolt lock back issues, ect.). We just don't remember because those particular companies have been excellent with regards to CS on replacing customers problem mags. We only remember the bad stuff (like my crappy ASC .308 10rnd mags or Elftmann Tactical's debatable engineering methods and lack of care for the customer...).

It's all about the Horus now!

If going for a lighter trigger I'd only swap the trigger spring. You want a full power hammer spring.

b-b-but it has like eleventy LEDs! On another note, is your front sight backwards?